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制备了近纳米级的聚苯乙烯-丙烯酸丁酯(PS-PBA)复合微球粒子,并在40Hz～110×106Hz的宽频范围测量了该粒子分散在9种电解质中时的介电弛豫谱,发现了与PS微球粒子分散系不同的特异介电弛豫:低频弛豫对反离子种类具有敏感性而高频弛豫则与电解质种类几乎无关;根据Shilov-Dukhin模型和M-W-O模型分别分析了高、低频率的弛豫机制,并通过对介电谱的Cole-Cole拟合获得了各体系的介电参数.进一步利用Hanai方法由介电参数计算获得了所有体系的相参数;详细分析了体系的内部参数受PS-PBA微球自身结构以及电解质种类影响的原因;讨论了离子扩散系数对介电参数的影响,从而得出了低、高频的弛豫特征时间分别由同离子的扩散系数和反离子的扩散系数所决定之结论.最后,结合Grosse宽频介电理论计算了粒子表面的以及双电层的主要电参数,并分析了电解质种类差异对这些电参数的影响.
Near-nanometer polystyrene-butyl acrylate (PS-PBA) composite microspheres were prepared and their dielectric relaxation spectra were measured in the wide frequency range from 40Hz to 110 × 106Hz , We find that the low frequency relaxation is sensitive to the type of counterion and the high frequency relaxation is almost independent of the electrolyte type. According to Shilov-Dukhin model and MWO model, High and low frequency relaxation mechanism, and through the Cole-Cole fitting of the dielectric spectra obtained the dielectric parameters of the system.Further use of Hanai method from the dielectric parameter calculation of all the system parameters; detailed analysis The internal parameters of PS-PBA microspheres were affected by their own structure and electrolyte type. The influence of ion diffusion coefficient on the dielectric parameters was discussed. It was found that the relaxation time of low-frequency and high- Diffusion coefficient and counterion diffusion coefficient.Finally, the main electrical parameters of the particle surface and the electric double layer were calculated with the Grosse theory of broadband dielectric, and the difference of electrolyte type was also analyzed. The impact of number.